Standard Form:

ax+by=c
In standard form, there cannot be a fraction and x cannot be negative.
Start with an equation in Slope Intercept form
( y=mx+b):
y=-2x+3
Now, we have to write this equation in standard form.
To do that we have to do opposite operations. We want -2x on the left side of the equal sign so we'd add 2x to each side.
Now we have
y+2x=3. The x has to be in front so we can just switch them since were adding.
Answer:
2x+y=3